Sharpening device



Patented Nov. 11, 1924.

UNITED STATES .AR'IUR HAAS, OF BEECHHURST, NEW YORK.

SHARPENING- DEVICE.

Application filed February 9, 1924. Serial No. 691,579.

To all; whomit may concern:

Be it known that I, Aaron Hans, a subject of the German Empire, residing-at Beechhurst, Long Island, in the county of Queens and State of New York, have invented certain new and useful Improvements in Sharpening Devices, of which the following is a specification.

This invention relates to an improved sharpening device; particularly a sharpening device for renewing the edges of knives and other cutting implements.

An object of the invention is to provide a sharpening device of simple construction, adapted to perform the sharpening operation easily and quickly, and having much greater durability than other devices of the same general class now in use.

A preferred embodiment of the principle of my invention is illustrated in the accompanying drawings, but I of course reserve the right to make changes in details of structure, not necessarily shown herein, but embraced within the nature and scope of the invention, as the appended claim defines the same.

Figure l is a side view of a sharpening device according to my invention;

Figure 2 is a top plan thereof;

Figure 3 is a front view of the support or framework for mounting the operating parts or elements, which are omitted in this view; and

Figure 4 is a separate view of one of the sharpening elements.

The same numerals identify the same parts throughout.

The sharpening device presented in the drawings comprises a base or plate 1, and a number of rotatable sharpening elements 2, loosely mounted to turn on pivots 3. The plate 1 has a pair of upright portions 4 at each side, and these supports are rounded at their upper ends 5, which are perforated to receive the pivots 3. Preferably, the plate 1 is made of sheet metal wit-h lateral extensions to provide the portions 4, and these extensions are bent up into substantially parallel position, as indicated in Figures 1, 2 and 3. On each pivot is a number of sharpening elements 2, placed side by side, and each able to turn independently of the others. The ends 5 of the upright portions 4, on each side, are separated by a recess 6; and the sharpening elements 2 overlap each other slightly in line with the two opposite recesses 6. In practice, the knife, indicated in broken lines at B, in Figures 1 and 2, is placed edge downward in the recesses 6 in contact with the operating faces of the elements 2, and then drawn across these elements till the edge of the blade of the knife is as sharp as is desired.

The rivets 3 have the form of steel spindles or journals held fast in the openings in the portions 4, and with their opposite ends riveted, or headed to make them tight. Each of the elements 2, while able to turn on its spindle or journal 3, cannot move along the spindle carrying it, or crosswise of the spindle. ing the knife B between the elements 2, is always fixed and constant.

Each element 2 includes a hub 8, a flange 9 having circumferential ribs 10, and a bore 11 to receive one of the spindles 3. These elements are of steel, hardened by a special process. The presence of the ribs or ridges 10, which terminate in well defined edges, gives each element 2 a number of points of contact with the edge of the blade B, and thus enables the operator to perform the sharpening operation in the shortest possible time. The hubs 8 are smaller than the flange 9, so that the flanges only overlap in line with the recesses 6. As the device is put successively to use to sharpen one knife after another, the elements 2 turn 011 their pivots 3, presenting new points to the edge to be sharpened, and thus too much wear at any one point is avoided. The fact that the elements 2 cannot move crosswise of the spindles 3; that is, towards or away from each other, is important, because the angle 7 is thus prevented from changing. Otherwise, the angle 7 would vary considerably as the knife is moved across the flanges carrying the ribs 10, and no uniform sharpening effect could be obtained. The result would then be a relatively poor edge, and a T? longer time would be required. But with the device constructed as set forth, a knife can be sharpened very quickly and readily with little effort, a very good even edge is afforded, and the device further will last for a very long period.

At one end in the plate 1 will be a hole 12, for hanging the sharpener up; and if desired the other end of the plate may be extended and the opposite edges 13 of this extended end may be turned up and brought together to make a handle 14. This handle Hence the angle 7 receivmay be omitted if, desired, and the plate 1 may have two holes 12 at opposite extremities to permit it to be nailed down upon a table or block.

Having described my invention What I believe to be new and desire to secure and protect by Letters Patent of the United States is A sharpening device comprising a metal plate having upturned portions at each side, a pair of transverse rivets mounted in said portions, and a plurality of sharpening ele ments rotatably mounted on said rivets, said elements being held in fixed positions, with respect to one another, each individual element comprising a hub and a flange integral With each other, each flange having circumferential ribs or ridges, the flanges of the elements on the one rivet overlapping the flanges of the elements on the other rivet to provide a constant angle between said elements to receive the edge of the blade to be sharpened. v

In testimony whereof I affix my signature.

ARTUR HAAS. 

